Pencil



May 8, 1928. Y 3,669,378

J. P. LYNN PENCIL Filed May 2Oa 1,926

Patented May 8, 1928.

UNITED STATES PATENT OFFICE.

JOHN P. LYNN, F CHICAGO, ILLINOIS, ASSIGNOR T0 DUB-O-LITE PENCIL COMPANY, OFCHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

FENCE Application led lay 20, 1926. Serial No. 110,519i.

This invention relates -to a pencil having a hollow body through which a lead may be fed into position for writing, and more particularly to certain means or mechamcally 6 advancing the lead, as desired.

In a pencil of this general character I have incorporated certain improvements which conduce to simplicity in construction and operation. For this purpose I associate with the body a rotatable tip which induces travel of a propeller by which a lead is expelled through the tip end of the pencil. The construction of the tip, also its connection with the pencil body, presents certain l5 improved features which will be hereinafter set forth at length.

-In the accompanying drawing is shown an exemplitication of my invention the manner following:

Figure 1 is a view in elevation of the pencil in its entirety; O

Fig. 2 is a longitudinal section taken centrally therethrough;

Fig. 3 is a view, partly 1n elevation and partly in section, of the pencil tip perse;

Fig. 4 which is a similar view, shows the ferrule body expanded as when removed from the enci Fig. 5 is a longitudinal sectionthrough the eraser holder detached from the pencil; Figs. 6, 7, and 8 are enlarged transverse sections through the pencil taken, respectlively, on lines 6 6, 1 -7, and 8 8, of

Fig. 9 is a fra entary sectional view through a pencil tip of modied construction; and 0 Fig. 10 is atop plan view of the tip shown in'Fig. 9. A

The present pencil may comprise a body A having at one end thereof a rotatable tip B and at the o posite end a ferrule C wherein is retaine an eraser by any suitable means. In the upper portion of the pencil body is a chamber 11 forming a magazine for reserve leads and closed at its bottom as by a late `12. Extending from the bottom of this chamber is an axial bore for the accommodation of a threaded propeller 13 havin at its upper end a head 14 with a latera projection which is slidably received within a slot 15 to one side of the bore. At its lower end the bore enters an enlar ed chamber 16. At the point of 'uncture e,

tween the bore and chamber provide a transverse plate 17 having an opening through which the propeller body may freely move. This plate which is engaged by the head 14. when the propeller is advanced to its limit serves as a stop to prevent removal of the propeller from the pencil bod The walls of the chamber 16 are preferably lined with a bushing 18 as shown.

The body A of the pencil is preferably formed of a plastic material which can be readily molded or pressed to the desired shape around the bushing 18, which serves as an anti-friction lining to the chamber 16.

The tip which I have designed for association with a pencil body so constructed may be of metal or other material. As shown in Figs. 2, 3 and 4, the ti comprises an outer conical wall 2O straig tened near its upper end into cylindrical form as at 21 so as to be tttable around the lower end of the pencil bod where an annular recess may be provided or accommodating the tip in flush relation therewith. Secured within the cylindrical portion of the tip is a head 22 from which upstands a tube 23 having one or more longitudinal slots 24 therein. The normal tendency of the tube walls is to spring outwardly as indicated in Fig. 4, but when fitted within the bushing 18 they are straightened into substantial cylindrical form, as in Fig. 3. In this manner, I provide a frictional connection between the tip and pencil body permitting the one part to be rotated relative to the other.

The walls of the tube 23 are inturned at the upper end to -provide a depending cup 25 having screw threads therein which c0- operate with those -on the propeller 13.

Joined to the cup is an inner tube 26 which extends substantially for the length of the 'tip to furnish a guide for the propeller and lead 27 therein. At its lower or constricted end the tip may be formed with one or more slots 28 providing spring sections between which the lead is gripped yieldingly.

A substantially similar construction of tip is set forth in Figs. 9 and 10. In this case the tip and tube are moulded as an integral product, the latter being provided with a cross slot 30 at its upper end. Surrounding 105 the tube is a slotted sleeve 31 which tends normally to bow outwardl after the manner shown in Fig. 4.- At its lower end the -sleeve may be inturned as at` 32 to tit within a groove on the tube. To prevent rotation iie 4cross wall is a threaded cup 34 adapted to co-operate with the threads of the propeller 13 in the manner already explained.

With a pencil of the general kind described, I may associate an eraser which,

as shown, is provided with a cup-shaped re tainer 36, the walls of which are slotted so as to permit the retainer to spring outwardly as shown in Fig. 5. An eraser and retainer of this kind may be fitted within the ferrule C which acts to compress the cu upon the eraser whereby it is held securely in place. If desired,`the cup walls adjacent their upper edge may be outwardly beaded at 37 and then inturned at 38 to pro# vide an edge which will bite into the eraser when the parts are assembled in the position shown in Fig. 2. For purposes of ornamentation, any suitable cap may be applied over the eraser, if desire I claim:

1. A pencil having a body with an axial nonround bore which at its lower end isenlarged into a chamber, a screw-threaded propeller movable longitudinally through the bore and chamber, a tip removably associated with the pencil body having a cyf lindrical tube with outwardly sprung walls rictionally fitted within the chamber, an inner guide tube supported in the tip and cylindrical tube and providing a guide for a lead and the propeller, screw means associated with one tube for engaging the screw threads on the propeller, and means on the propeller co-,acting with the nonround bore in t e pencil body for holding the propeller against rotation, substantially as described.

2. A pencil having a body in which is an axial nonround bore communicatin with an enlarged chamber at the lower body end, a screw-threaded propeller slidingly fitted within the nonround bore having means coacting therewith-for preventing its rotation therewithin, a tip fitted to the lower encil.

end and provided with a cylindrica tube the walls of which are inturned at the up per end to provide a screw-threaded cup for en aging with the threads of the propeller,

an an inner tube joined to the cup extending lengthwise. of the tip and providing a gulde for the propeller, substantially, as described.

3. A pencil having a body in which is an axial nonround bore which communicates -with an enlarged chamber at the lower body end, a busliin fitted within the chamber to provide acylindrical lining therefor, a tube ongitudinally slotted to provide spring sections normally bowed outwardly adapted for fitting within the bushing, the tube walls being inturned at the u per end to form a cup which is screw-threa ed and adapted to enlthe chamber and extendin .a tubular sleeve forming gage the threads of the propeller, a second tube within the first jolned at its upper end to the cup thereof and extended therebelow to furnish a guide for the propeller, and tapering lwalls connecting the lower end of the inner tube with the lower portion of the p transversely within the pencil body adjacent thevlower end of the bore, a screw-threaded propeller longitudinally movable through the bore and plate and retained byl said plate, there being means for preventing rotation of the propeller within the bore, a tip fitted to the lower end of the pencil body and comprisin an axial guide tube'into which, the prope er may advance, and means for supporting the upper end'of the guide tube, comprising an outer tube joined to the tip and having cylindrical spring walls frictionally bearing against the inner face of the chamber and inturned at their upper ends to connect with the inner tube, there being screw threads formed in the tube walls with which the threads of the propeller may engage, substantially as described.l

5. In a pencil, the combination of a tip having tubular double walls the inner of which furnishes a guide for a movable lead, a chambered body with which the outer tip walls are removably engaged, a threaded propeller movable nonrotatably throu h into the guide, stop means independent o the tip for preventing removal of the propeller from the body, and screw-threaded means associated with the tip for engaging the propeller to move the same longitudinally, substantially as described.

6. In a pencil having a chambered body, a lining therein, the combination of a tip havin an axial tube, said tube having outwar ly bowed walls connected at their upper ends to exert a radial tension against the lining when the tip is operatively associated with the4 encil upon rotation of the tip relative to the encilV the propJeller is advanced longitu inalbod ly t ereo vsu stantially as described.

7 In a encil, the combination of a chambered bo y, a double walled tube formed internally `with screw threads, the outer wall forming a guide for a lead, a conical wall of sheet metal forming the lower end of said tip and extended in spaced relation to the tubel to surround the lower body end, and a propeller slidable non-rotatably within the body and in' engagement wit the screw-threads of the tip, Lsubstantially as described.

8. In a pencil, the combination of a chambered body wherein is` removably received a tube extending axially from a tip, the tube walls being longitudinally slotted intermediate its ends to provide bowed spring sections which exert an outward pressure against the chamber walls whereby to assure a frictional connection therewith, a lead guide extending centrally within said tube and tip and means operable by rotation of the tip relative to the pencil body for advancing a lead longitudinally thereof, substantially as described.

9. An automatic pencil comprising a body of molded plastic formed with a chamber at one end thereof, a hard metallic tubular bushing rigidly mounted within said chamber and forming a lining therefor, a removable tip having an outwardly bowed resilient tubular extension frictionally and rotatably mounted within said tubular bushing, a lead ide extending centrally within said tip an tubular extension.

10. An automatic pencil having a cylindrical body portion, a tip rotatably mounted therein for advancing a lead comprising a tapered lower portion and a relatively short tubular upper extension, said upper extension being of slightly less diameter than said lower portion and having a bowed portion intermediate its ends only for frictional engagement within said cylindrical body, whereby said tip may be readily withdrawn from or -inserted into said chamber, and a lead guide extending centrally within said tip and upper extension. l

' JOHN P. LYNN. 

